Assess your situation Identify the afflicted drain and extent of backup Examine if numerous drains are affected (implies key line issue) Try to look for obvious water problems or overflow Basic Do it yourself Steps Pour boiling h2o down drain Use plunger suitable for sink/toilet Try out baking soda + https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/